Cylindrical battery and battery module

Abstract

Provided is a cylindrical battery including: a shaft core; a set of wound electrodes including an electrode stack wound on the shaft core; an exterior member surrounding the set of wound electrodes; a cap disposed at one axial end of the shaft core and electrically connected to one of the positive and negative electrodes; and an insulating member disposed between the exterior member and the cap, the cap having an outer diameter that is larger than the inner diameter of the exterior member and smaller than the outer diameter of the exterior member, the insulating member having an outer diameter larger than the outer diameter of the cap, the insulating member having a protrusion that is located more inside in the radial direction of the set of wound electrodes than the inner surface of the exterior member and protrudes toward the set of wound electrodes.

What is claimed is: 
     
         1 . A cylindrical battery comprising:
 a shaft core;   a set of wound electrodes comprising an electrode stack wound on the shaft core and comprising a positive electrode, a negative electrode, and an electrolyte provided between the positive and negative electrodes stacked;   an exterior member surrounding the set of wound electrodes;   a cap disposed at one axial end of the shaft core and electrically connected to one of the positive and negative electrodes; and   an insulating member disposed between the exterior member and the cap,   the positive electrode comprising a positive electrode current collector and a positive electrode material mixture layer provided on the positive electrode current collector,   the negative electrode comprising a negative electrode current collector and a negative electrode material mixture layer provided on the negative electrode current collector,   the exterior member being the positive electrode current collector or the negative electrode current collector extending from a distal end of the set of wound electrodes, the distal end not being in contact with the shaft core,   the cap having an outer diameter that is larger than an inner diameter of the exterior member and smaller than an outer diameter of the exterior member,   the insulating member having an outer diameter larger than an outer diameter of the cap,   the insulating member having a protrusion that is located more inside in a radial direction of the set of wound electrodes than an inner surface of the exterior member and protrudes toward the set of wound electrodes.   
     
     
         2 . The cylindrical battery according to  claim 1 ,
 wherein the shaft core comprises a first electrically-conductive part, an insulating part, and a second electrically-conductive part arranged in an axial direction, and   wherein the insulating part is disposed between the first and second electrically-conductive parts and joined to the first and second electrically-conductive parts.   
     
     
         3 . The cylindrical battery according to  claim 1 , wherein the cylindrical battery has a space filled with a sealing resin between the exterior member and the insulating member and has a space filled with a sealing resin between the cap and the insulating member. 
     
     
         4 . The cylindrical battery according to  claim 3 , wherein the insulating member further has a second protrusion that is located more outside in the radial direction of the set of wound electrodes than the cap and protrudes away from the exterior member. 
     
     
         5 . The cylindrical battery according to  claim 3 , wherein the insulating member further has a through hole passing through a space between the insulating member and the exterior member and another space between the insulating member and the cap. 
     
     
         6 . The cylindrical battery according to  claim 3 , wherein the distance between the exterior member and the insulating member in an axial direction of the shaft core is larger at a radially outer portion than at a radially inner portion in the radial direction of the set of wound electrodes. 
     
     
         7 . The cylindrical battery according to  claim 1 , wherein the electrode stack includes a solid electrolyte layer provided between the positive and negative electrodes stacked. 
     
     
         8 . A battery module comprising a plurality of the cylindrical batteries according to  claim 1 .